Quote:
Originally Posted by TowelThief
Mobil1 5W30.
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Unrelated to the "hiss and spark" sound at shutdown, but my experience with Mobil 1 5W30 has been valvetrain ticking noise at hot idle. Heard it loud and clear with mechanic's stethoscope. No indication of excessive wear but the ticking was annoying.
I've had quietness with Mobil 1 0W-40 European Car, Valvoline MaxLife Synthetic Blend, and Valvoline High Mileage Synthetic. The champion of quietness has been plain old Pennzoil High Mileage conventional/synth blend.
All of these have higher concentrations of extreme pressure anti-wear additives {moly, zinc, phosphorous} than regular Mobil 1 5W-30.
With the Valvolines, I run 5W-30 in winter and 10W-30 in summer. Not sure the engine gets any benefit from switching viscosity. My engine has 270K miles on it and no doubt the bearing clearances have opened up over the years/miles.
Next oil change this fall, I'll be using Valvoline Extended Protection 5W-30. Typing this...I'm not sure why I switched from Pennzoil High Mileage other than Valvoline's rebate back when I bought it. It's cheap, it works well.
Also, post a video of the hiss and spark sound at shutdown.